Commercial HVAC
Repair & installation tailored for your business.
Commercial HVAC is a different discipline from residential work. A packaged rooftop unit serving a 40,000 square foot warehouse fails differently than a home furnace, the economizer and controls matter as much as the compressor, and the cost of a bad diagnosis is measured in lost operating hours rather than an uncomfortable evening. JNC Mechanical works exclusively at that scale across Los Angeles and Orange County.
We service and install rooftop package units, split and multi-split systems, air handlers, condensers, VAV boxes, and the duct and air distribution that ties them together. That means a single contractor can follow a problem from the thermostat to the roof curb instead of handing it off halfway. Most calls start with a diagnostic and a written quote before any parts are ordered, so a facility manager knows the number before committing.
Buildings we work in include offices, warehouses and distribution, retail, restaurants, medical and dental suites, schools, churches, and light industrial. Equipment condition ranges from new construction to twenty-year-old units nobody has opened since installation, and we quote repair against replacement honestly rather than defaulting to whichever is larger.
What this service covers
- Rooftop package unit diagnosis, repair, and replacement
- Split system and multi-split installation and service
- Air handler, condenser, and evaporator coil work
- VAV box, economizer, and air distribution troubleshooting
- Thermostat, sensor, and basic control replacement
- Roof curb, duct transition, and code-compliant tie-in
- 24/7 emergency response for commercial accounts
Call us when
- One zone of the building will not hold temperature while the rest is fine
- A rooftop unit is short-cycling, tripping a breaker, or icing up
- Energy cost has climbed without a change in occupancy or hours
- A unit has been repeatedly repaired and you need an honest repair-vs-replace number
- You are taking over a building and need the existing equipment assessed
Commercial HVAC questions
Do you work on residential HVAC?
Our focus is commercial and industrial equipment. We are set up for rooftop units, chiller plants, and building systems rather than home furnaces and residential condensers.
How fast can you get to a commercial breakdown?
We run 24/7 emergency dispatch for commercial clients. Call (562) 644-2129 and we will tell you honestly when a technician can be on site rather than quoting a response time we cannot hold. Preventive maintenance contract clients get priority in the queue.
Can you take over service on equipment another contractor installed?
Yes. We regularly pick up buildings mid-life. We will assess what is installed, tell you what condition it is in, and work on it regardless of who put it in.